Boring-tool.



B 0 R l N G T00 L.

(Application led. Sept. 6, 1901.

(nu Modal.)

TH: Nonms Pzfsns co, Pnorourvo.. WASHINGTON. n. cy

No. 696,902. lPatented Apr. I, |902. A JpRAY,4 Sn.

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(Application filed Sept. 6, 1901.)

2 Sheets-Sheeii 2.

(No Model.)

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UNITED STATES PATENT fErrcE.

JOHN GRAY, SR., OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR OFONE-HALF TO CHARLES S. CAMPBELL, OF WASHINGTON, DISTRICT OF i similarview showing a modification.

COLUMBIA.

BORING-Tool..

SPECIFICATION forming part of Letters Patent No. 696,902, dated April 1,1902.

Application filed September 6, 1901. Serial No, 74,499. (No model.)

To all whom t 11i/ty concern.-

Beit known thatl, JOHN GRAY, Sr., a citizen of the United States,residing at Washington, in the District of Columbia., have inventedcertain new and useful Improvements in Boring-Tools, of which thefollowing is a specification. l

This invention relates to tools or implements for boring.

In many instances it is found that owing to limited or confined spaceWithin which to work, that the tools ordinarily employed in`lhereinafter described, and particularly set forth in the claims.

In the accompanying drawings, in which similar letters of reference areused to denote corresponding parts in each of the several views, Figurelis a perspective view of a tool embodying my invention. Fig. 2 is alongitudinal axial section thereof. Fig. 3 is a Figs. 4 and 5 arelongitudinal sections illustrating the tool at the opposite limits ofits movement. Figs. 6 and 7 are details of essential parts.

threaded engagement withthis shaft C, and

between this nut and the chuck B is confined a coiled spring E, thestress of which is exerted to thrust said chuck in the direction of theopen end of the tool-body A.

Referring now specifically to Figs. 2, 4, 5, and 7, the nut D comprisestwo halves d CZ, between which are inserted springs cl d', in thisinstance shown as spiral springs, which tend to thrust the parts of thenut asunder, and hence out of threaded engagement with the screw-shaftC. The forward end of the nut is tapered or cone-shaped, and inengagement with such cone-shaped end is a correspondingly-aperturedfollower or abutment F, which forms the surface or abutment, taking thethrust of the inner end of the spring E, and hence when tension is uponsaid Vspring forcing and holding the two parts of the nut together andinv threaded engagement with the screw-shaft C. From this constructionit will be observed. that when there is tension upon the spring E, dueto its confinement or compression between the chuck and the nut D, thatthe split nut will be constantly in threaded engagement with thescrew-shaft; but when the tool has advanced so far in its work that the'chuck has advanced practically to its limit and the tension of thespring E is so reduced as not to overcome the tension of the springs d dthe nut will be no longer in operative engagement with the screw-shaftand may therefore be dropped back in the direction of the head a. Thelug or projection d2 works in a slot d3 in the tubular body A, thuscausing the nut D to ro tate with said tubular body.

In the instance shown the tubular body A is cylindrical incross-section, and the chuck B is retained from rotation therein bymeans of a stud or lug b, projecting therefrom into a longitudinal slotin the tool-body. It will be understood, however, that the tubular bodyA may be of angular cross -section, thereby avoiding the necessity ofproviding the slot and lug. At the inner `end of the longitudinal slotof the tool-body is shown a recess h to receive the lugb of thechuck,the purpose being to lock the chuck and bit in its retracted position.

The rear end of the tool-body carries a swiveled head G, provided withspurs or IOO advance the bit in the act of boring.

Io'stance shown the head Gr is provided with lugs g', in operativeengagement with longitudinal slots h of the sleeve H, said slots beingprovided at suitable intervals with recesses h', affording lockingengagement with the lugs g', and thus providing for the adj ustment inlength of the tool as a whole and at the same time preventing therotatiouof shaft C when the tool is in use.

The tool-body may be fitted with any apzo propriate means for effectingits rotation, the

means shown being a collar I, rigidly secured to the too'l-body andprovided with detachable rods or handholes t', as shown. This has beenfound a convenient construction, for the reason that the rods may beremoved from the collar, thus reducing the lateral bulk of the tool whennot in use. In the drawings the collar I is shown secured to thetool-body by means of screws i.

In Fig. 3 is .illustrated a form of the device wherein the nut orabutment D is solid and must be retracted by a reversal of the movementof the tool-body A with respect to the screw-shaft C. This figure alsoshows the tool as non-adjustable in length and as being iitted at itsopen end with means to provide for the use of a bit smaller than thediameter of the tool-body. This means consists of a ferrnle .of properdiameter slipped within the 4o open end of the tool-body and securedtherein in any appropriate manner. It will be understood that in theevent of making the toolbody of angular cross-section that such aguiding-ferrule would be necessary even with the largest bit capable ofuse in the tool.

Having thus described the construction of my invention, the operation isas follows: A suitable bit having been selected and fitted to the chuck,the latter being in place in the 5o tool-body, the point of the bit isnow set against any suitable fixed support and pressure applied to theother end of the tube to force the bit back into the tube, the lug orprojection b traveling inxthe slot in the tubebody until it reaches therecess b', into which it is inserted by a slight axial movement impartedto the tube. This operation of setting the tool compresses the spring E,and in this condition the spring is held by reason 6o of the lug beinglocked in the retaining-recess b. The tool is now inserted between thejoists, as shown in Fig. 5, and the lug is released from the recess b',which permits the tension of the spring to be exerted on the bit.y Thetube is now rotated by means of the radial arms I I I, which through theintermediate.

mechanism already described rotates the bit and causes it to enter thework in the usual manner. The screw-shaft C remains stationary, whilethe nut D, rotating with the tube, is fed outwardly and keeps up. aconstant pressure on the spring E to compensate for` the forwardmovement of the bit. After the hole has been bored the bit is passedthrough the hole, thus detaching it from .the tool proper, which is nowremoved from the work and the bit, chuck, spring, and nut restored totheir normal positions.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is-

l. In a tool of the character described, the combination with thetubular body, of a longitudinally-movable chuck, a longitudinallymovablefollower or abutment, a spring confined between the chuck and abutment,means for advancing the follower or abutment as the work progresses, andmeans for disconnecting the abutment from its advancing means.

2. In a tool of the character described, the combination of the tubularbody, the chuck, the swiveled head, the compression-spring, thescrew-shaft, the divided cone-shaped nut provided with springs adaptedto thrust the two parts of said nut out of engagement with thescrew-shaft, and a follower or abutment.

3. In a tool of the character described, the

combination of the tubular body, the chuck,

the swiveled head provided with spurs or tangs, the compression-springand the screwshaft and automatically-actuated divided nut.

4. In a tool of the character described, the combination of the tubularbody, the chuck, the swiveled head, the compression-spring, thescrew-shaft, the automatically-actuated divided cone-shaped nut and itsfollower or abutment.

5. In a tool of the character described, the combination with a tubularbody, a longitudinally-movable chuck,a longitudinally-movable followeror abutment, a spring confined between the chuck and abutment, means foradvancing the follower or abutment as the work progresses, and alongitudinally-adjustable sleeve.

6. In a tool of the character described, the combination with thetubular body, a longitudinally-movable chuck, a longitudinallymovablefollower or abutment, a spring confined between the chuck andabutment,means for advancing the follower and abutment as the workprogresses and a longitudinally-adjustable sleeve provided with spurs ortangs, substantially as described.

7 In a tool of the character described, the combination of the tubularbody, the chuck, the swiveled head, the compression-spring, thescrew-shaft, the automatically-actuated divided nut, its follower orabutment, and a collar secured to and surrounding the tubular body andprovided with handholds, substantially as described.

8. In a tool of the character described, the

IOO

IIO

l A Y combination of the tubular body, the chuck, alongitudinally-adjustable sleeve provided with spurs or tangs, the headoperatively secured to said sleeve, the compression-spring, thescrew-shaft, and the automatically-aetnated divided cone-shaped nut andits follower or abut-ment.

9. In a tool of the character described, the combination of the tubularbody, the longitudinally-movable chuck, a longitudinallymovable followeror abutment, a spring conned between the chuck and abutment,afer rulesecured in the open end of the tubular body, and means for advancing thefollower or abutment as the work progresses.

10. In a tool of the character described, the

JOHN GRAY, SR.

Witnesses:

CHAs. E. RIORDAN, T. BLAIR SHOEMAKER.

